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有机和无机的同位素组成揭示了污染影响和未开发的河口地点的加工和来源动态

Yixi Qiu¹, J David Felix², Dorina Murgulet²

¹Center for Water Supply Studies, Department of Physical and Environmental Science, Texas A&M University-Corpus Christi, Corpus Christi, TX 78412, USA; Department of Integrative Biology, Michigan State University, East Lansing, MI 48824, USA.

The Science of the total environment

|March 17, 2024

概括

溶解有机 (DON) 在河口中至关重要,但人们对其了解甚少. 这项研究量化了德克萨斯州巴芬湾的DON及其来源,使用稳定的同位素揭示了循环路径.

科学领域:

河口生物地质化学
环境化学环境化学
稳定同位素地球化学

背景情况:

溶解有机 (DON) 是河口中重要的成分,但其来源和加工仍未得到充分研究.
河口是营养循环的关键接口,但像巴芬湾这样的低流量系统为管理带来了独特的挑战.
了解动态对于河口健康和管理人为影响至关重要.

研究的目的:

量化巴芬湾的溶化有机 (DON) 池,巴芬湾是一个半干旱的低流量河口.
使用稳定同位素技术识别DON和溶解无机 (DIN) 的潜在来源.
在对比的河口地区,从地下水到地表水中处理的特征.

主要方法:

对 (NH4+),酸盐 (NO3-) 和DON的稳定同位素分析 (δ15N).
在地下水,孔水和地表水中量化物种.
在受污染影响的和未开发的河口区域中比较形状和同位素特征.

主要成果:

受污染影响的地区的地下水显示高NO3,DON和δ15N值,表明污染和化/脱.
未开发地区的地下水表现出海湾水淹没的特征,含量高的NH4+和较低的δ15N-NH4+.
DON约占地表水中溶解的98%,尽管有不同的地下水输入,但具有相似的配置,归因于低的去除率和长时间的停留时间.

结论:

溶解有机 (DON) 在巴芬湾等低流量河口的预算中发挥着主导作用.
稳定同位素分析对于追踪源和理解涉及DON和DIN的复杂循环路径是有效的.
这些发现凸显了在河口管理中考虑DON的必要性,并为全球研究类似系统提供了一个框架.

关键词:

巴芬湾,德克萨斯州,德克萨斯州溶解的无机是溶解的无机.溶解的有机气是一种有机气.低流入的河口河口.处理的过程.稳定的同位素分析.

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